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The Transiting Multi-planet System HD 3167: A 5.7 M ⊕ Super-Earth and an 8.3 M ⊕ Mini-Neptune

Gandolfi, Davide (author)
Universita degli Studi di Torino,University of Turin
Barragán, Oscar (author)
Universita degli Studi di Torino,University of Turin
Hatzes, Artie P. (author)
Thüringer Landessternwarte Tautenburg
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Fridlund, Malcolm, 1952 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Fossati, Luca (author)
Donati, Paolo (author)
Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory
Johnson, Marshall C. (author)
Ohio State University
Nowak, Grzegorz (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Prieto-Arranz, Jorge (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Albrecht, Simon (author)
Århus Universitet,Aarhus University
Dai, Fei (author)
Princeton University,Massachusetts Institute of Technology (MIT)
Deeg, Hans (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Endl, Michael (author)
The University of Texas at Austin, USA
Grziwa, Sascha (author)
Universität zu Köln,University of Cologne
Hjorth, Maria (author)
Århus Universitet,Aarhus University
Korth, Judith (author)
Universität zu Köln,University of Cologne
Nespral, David (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Saario, Joonas (author)
Nordic Optical Telescope
Smith, Alexis M. S. (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Antoniciello, Giuliano (author)
Universita degli Studi di Torino,University of Turin
Alarcon, Javier (author)
European Southern Observatory Santiago
Bedell, Megan (author)
University of Chicago
Blay, Pere (author)
Instituto de Astrofísica de Canarias,Nordic Optical Telescope
Brems, Stefan S. (author)
Cabrera, Juan (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Csizmadia, Szilard (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Cusano, Felice (author)
Istituto nazionale di astrofisica (INAF)
Cochran, William D. (author)
The University of Texas at Austin, USA
Eigmüller, Philipp (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Erikson, Anders (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
Hernández, González (author)
Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
Guenther, Eike W. (author)
Thüringer Landessternwarte Tautenburg
Hirano, Teruyuki (author)
Tokyo Institute of Technology
Suárez Mascareño, Alejandro (author)
Université de Genève,University of Geneva,Instituto de Astrofísica de Canarias
Narita, Norio (author)
University of Tokyo, Japan,National Astronomical Observatory of Japan,National Institutes of Natural Sciences (NINS)
Palle, Enric (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Parviainen, Hannu (author)
Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
Pätzold, Martin (author)
Universität zu Köln,University of Cologne
Persson, Carina, 1964 (author)
Chalmers tekniska högskola,Chalmers University of Technology
Rauer, Heike (author)
Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR),Technische Universität Berlin
Saviane, Ivo (author)
European Southern Observatory Santiago
Schmidtobreick, Linda (author)
European Southern Observatory Santiago
Van Eylen, Vincent (author)
Universiteit Leiden (UL),Leiden University (UL)
Winn, Joshua N. (author)
Princeton University
Zakhozhay, Olga V. (author)
Main Astronomical Observatory Nasu
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 (creator_code:org_t)
2017-08-31
2017
English.
In: Astronomical Journal. - : American Astronomical Society. - 1538-3881 .- 0004-6256. ; 154:3, s. 123-
Related links:
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https://doi.org/10.3...
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • HD 3167 is a bright (V = 8.9 mag) K0 V star observed by NASA’s K2 space mission during its Campaign 8. It has recently been found to host two small transiting planets, namely, HD 3167b, an ultra-short-period (0.96 days) super-Earth, and HD 3167c, a mini-Neptune on a relatively long-period orbit (29.85 days). Here we present an intensive radial velocity (RV) follow-up of HD 3167 performed with the FIES@NOT, HARPS@ESO-3.6 m, and HARPS-N@TNG spectrographs. We revise the system parameters and determine radii, masses, and densities of the two transiting planets by combining the K2 photometry with our spectroscopic data. With a mass of 5.69 ± 0.44 M⊕, a radius of 1.574 ± 0.054 R⊕, and a mean density of {8.00}-0.98+1.10 g cm^-3, HD 3167b joins the small group of ultra-short-period planets known to have rocky terrestrial compositions. HD 3167c has a mass of 8.33-1.85+1.79 M⊕ and a radius of 2.74}-0.100+0.106 R⊕, yielding a mean density of 2.21-0.53+0.56 g cm^-3, indicative of a planet with a composition comprising a solid core surrounded by a thick atmospheric envelope. The rather large pressure scale height (∼350 km) and the brightness of the host star make HD 3167c an ideal target for atmospheric characterization via transmission spectroscopy across a broad range of wavelengths. We found evidence of additional signals in the RV measurements but the currently available data set does not allow us to draw any firm conclusions on the origin of the observed variation.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

planets and satellites: detection
planets and satellites: individual: HD 3167b
stars: individual: HD 3167
HD 3167c
stars: fundamental parameters

Publication and Content Type

art (subject category)
ref (subject category)

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